Paul Harteck and Karl Friedrich Bonhoeffer prepared parahydrogen at low temperatures in 1929. The experiment distinguished forms of molecular hydrogen associated with different nuclear-spin states, connecting a measurable sample property with the quantum description of spin isomers of hydrogen.[ref]
https://www.fhi.mpg.de/history. Institute history: 1929 purification of parahydrogen at low temperatures
Portrait of Paul Harteck
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